Masteries bug while in champion selection (draft modes)

This bug appears only when i'm in champion selection in draft modes, there is no problem with blind pick. When i want to choose my masteries, they have some strange names i never wrote, like RUmble, which is funny because i don't even own a Rumble, but i'm digressing. So, my masteries have different names in draft picks, but when i open them (to edit), they are perfectly normal, the names are the same as i wrote them.